The factors of 18 are 1, 2, 3, 6, 9 and 18. None of them are multiples of 5.
Which number is a factor of 10 , but not a multiple of 5
The only prime factor of 4 is 2. No prime number is a multiple of 5.
There is no such number.
The number 1 is a factor of 18 and 5.
If the other number is a multiple of 5, the GCF is 5. If it is not a multiple of 5, the GCF is 1.
10
Any number is a factor and a multiple of itself. Other factors are less than the number, other multiples are more. 5 is a factor of 10. 10 is a multiple of 5.
1 and 5
1 and 5
The number 5 is both a factor and a multiple of 5, because5 and 1 are both factors of 5.5, 10, 15, 20, 25... are multiples of 5. The common number is 5.
10 is a factor of 20 (10 * 2 = 20) and is a multiple of five (5 * 2 = 10).
Since 5 is a prime number it would probably not be a multiple of anything - so we would generally think of it as a factor.